Celecoxib 200 mg is a nonsteroidal anti-inflammatory drug (NSAID) used to treat mild to moderate pain and help relieve symptoms of arthritis, such as inflammation, swelling, stiffness, and joint pain. It is also used to treat ankylosing spondylitis, which is a type of arthritis that affects the joints in the spine. Celecoxib is also used to treat acute pain and menstrual cramps. Additionally, it is used to treat acute migraine headaches with or without aura. Celecoxib is in a class of NSAIDs called COX-2 inhibitors, which work by stopping the bodys production of a substance that causes pain and inflammation. If you are taking up to 200 mg of celecoxib capsules at a time, you should follow the dosage instructions provided by your doctor or pharmacist.